[mkgmap-dev] mkgmap (StyledConverter) Tile contains both drive-on-left an drive-on right

Hi, i am converting africa from http:\\download-geofabrik.de. mkgmap r-3671 ( and any older versions too ) give me a warrning : 'Schwerwiegend (StyledConverter): file xyz.osm.pbf :Attention: Tile contains both drive-on left (104037) and drive-on right roads (6443) '. in my STYLEFILE i have the option --drive-on=detect,right. The img-file is successfull created and routing works in Mapsource. But is the routing correct ? Tiles contains many different countries. What con i do to prevent the warning ? Thomas